For example, I've never really seen a video game where one of the characters seemed to be gay. You always have straight couples which I find kind of boring sometimes. Well, I guess this is due to the great amount of people who don't accept homosexuality but who knows... There might still be exceptions.
You need to get out there more then!
There are lots of shows with LGBT characters. To name a few: Doctor Who, Torchwood, Buffy the Vampire Slayer, Degrassi, Glee, Bedlam, and soo many more, but those are the ones off the top of my head.
For video games; Every romance character in Dragon Age 2 is bi, as well as in Dragon Age Origins there are two bi characters that I know of. Mass Effect has a quite a few as well. Skyrim has same sex marriage. Even games like Grand Theft Auto have a few LGBT characters.